Epimetopus, : Orchymont, 1933

Perkins, Philip D., 2012, 3531, Zootaxa 3531, pp. 1-95 : 12

Key to the groups of Epimetopus

1 Small to very small species (ca. 1.25–2.25 mm); pronotum and elytra usually reddish, head dark brown to piceous, elytra without fascia (e.g., Figs. 8–11); pronotum with, at most, minute secondary lobes; eye with incomplete canthus; aedeagus simple, without dorsal processes (e.g., Figs. 12–15)..................................................... Costatus Group

1' Usually larger species (ca. 2.00– 3.70 mm, but seldom less than 2.25 mm); head, pronotum and elytra usually dark brown to piceous, elytra often with lighter V-shaped fascia (e.g., Figs. 82, 107); pronotum with small to large secondary lobes; eye with canthus incomplete or complete; aedeagus with or without dorsal processes....................................... 2

2 Eye with canthus incomplete; size ca. 2.60–3.20 mm; pronotum with secondary lobes very small; pronotal hood carinae grooved (e.g., Figs. 73, 78); aedeagus with extendable hooks near apex of median lobe (e.g., Figs. 79–80).... Mendeli Group

2' Eye with canthus complete; pronotum with secondary lobes small to large; pronotal hood carinae grooved or non-grooved; aedeagus without extendable hooks near apex of median lobe................................................... 3

3 Aedeagus simple, without dorsal processes (e.g., Figs. 109–110); pronotum with large secondary lobes; pronotal hood carinae not grooved........................................................................................... 4

3' Aedeagus with dorsal processes on median lobe (e.g., Figs. 90, 98); pronotum with small to large secondary lobes; pronotal hood carinae grooved................................................................................... 5

4 Dorsum strongly tuberculate ( Fig. 124); pronotal hood carinae not confluent anteriorly; pronotal hood emarginate anteriorly...................................................................................... Tuberculatus Group

4' Dorsum strongly carinate, but not tuberculate (e.g., Figs. 107–108); pronotal hood carinae confluent anteriorly; pronotal hood sharply rounded anteriorly................................................................ Lanceolatus Group

5 Aedeagus with dorsal processes short, wide basally and pointed apically (e.g., Figs. 103–106); pronotum with secondary lobes very small............................................................................. Plaumanni Group

5' Aedeagus with dorsal processes long and slender, often with apices with ridges (e.g., Figs. 91, 112); pronotum with secondary lobes small to large.................................................................................... 6

6 Pronotum with very small secondary lobes (e.g., Figs. 86, 95); aedeagus with dorsal processes attaching to median lobe proximal to its midlength (e.g., Figs. 97, 98); usually smaller species (ca. 2.10–2.75 mm)................... Thermarum Group

6' Pronotum with large (five species) or small ( E. tridens ) secondary lobes (e.g., Figs. 111, 118); aedeagus with dorsal processes attaching to median lobe distal to its midlength (e.g., Figs. 112, 116); usually larger species (ca. 2.50–3.65 mm).. Trogoides Group